how to make a hole in a cube

As allways it will probably be very simple but can anyone tell me how to make a hole, like a window, in a cube.

Thanx

Go to Edit Mode. Select the vertices in the area of the future hole, hit X and select Erase Faces.

Alexandre Rangel

If you are trying to make a circular hole in a flat face, say you are starting with a plane that is only edges, no faces. Now add a circle, so it lines up with that face about how you want the edge of your hole. Then join the objects with ‘J’, go into edit mode,…select all the vertices of the circle, and the four of the plane, and hit ‘shift-F’
<edit> I just used that technique in this picture actually. upper left hand corner:
http://home.att.net/~yorik/DangerBoy/radrat.jpg